Set picocli's version at build time using the new //MANIFEST functionality

[helpermethod]

With the new //MANIFEST support, it's now very easy to set the version of a JBang picocli application at build time ❤️ !

Here are the necessary steps

Set the Implementation-Version to ${version} using the new //MANIFEST support

//MANIFEST Implementation-Version=${version}

Implement an IVersionProvider which reads the version from the manifest

static class ManifestVersionProvider implements IVersionProvider {
    public String[] getVersion() {
       return new String[] { getClass().getPackage().getImplementationVersion() };
    }
 }

Reference the versionProvider in picocli's @Command annotation

@Command(
    name = "p2e",
    mixinStandardHelpOptions = true,
    versionProvider = p2e.ManifestVersionProvider.class,
    description = "Convert Spring configuration property names to environment variable names."
)

Add a package (otherwise the MANIFEST.MF will not be found)

package com.github.helpermethod.p2e;

You can now set the version at build time!

jbang -Dversion=6.6.6 p2e.java --version

Works in the CI too

https://github.com/helpermethod/p2e/blob/main/.github/workflows/release.yml

[quintesse]

Thanks for providing an example of the new feature! 👍 🙂

[maxandersen]

In case you want it to work without always setting version you can do:

...=${version:dev}

[helpermethod]

Good point!